CAL45VB4R7K Equivalent & Substitute Parts

Part Overview

The CAL45VB4R7K is a 4.7 µH unshielded wirewound inductor manufactured by Taiyo Yuden, rated for 2.2 A continuous current with a maximum DC resistance of 79 mOhm. This component is designed for through-hole axial mounting applications requiring fixed inductance in the microhenry range.

The CAL45VB4R7K is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this inductor.

Substiute Parts

CAL45VB4R7K

Taiyo YudenIn Stock: 955CAL45VB4R7K Datasheet

Current PartRFQ

B78108E1472K000

EPCOS - TDK ElectronicsIn Stock: 6553B78108E1472K000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CAL45VB4R7K is determined by the following critical parameters:

Inductance Value: The substitute part must maintain 4.7 µH inductance with ±10% tolerance to ensure circuit functionality and frequency response characteristics.

Current Rating: The substitute must support the application's current requirements. The CAL45VB4R7K is rated for 2.2 A continuous current; substitute parts with equal or higher current ratings are acceptable.

DC Resistance: The substitute's maximum DC resistance must not exceed the original specification to prevent excessive power dissipation and thermal effects in the circuit.

Mounting Configuration: Both the main part and substitute must be through-hole axial components to ensure mechanical and electrical compatibility with existing PCB layouts.

Shielding Characteristic: The substitute must maintain the unshielded configuration to preserve electromagnetic coupling and interference characteristics of the original design.

Environmental Ratings: The substitute must support the operating temperature range and moisture sensitivity classification of the application.

The B78108E1472K000 manufactured by EPCOS - TDK Electronics meets these substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

The B78108E1472K000 is a direct functional substitute for the CAL45VB4R7K based on the following engineering criteria:

Electrical Equivalence: Both inductors provide 4.7 µH inductance with ±10% tolerance. The substitute's higher current rating of 2.75 A exceeds the original 2.2 A specification, providing additional thermal margin. The DC resistance differential of 6 mOhm (85 mOhm versus 79 mOhm) is within acceptable engineering tolerance for most applications.

Mechanical Compatibility: Both components are through-hole axial inductors with identical mounting configurations, ensuring direct PCB layout compatibility without redesign.

Product Availability: The B78108E1472K000 is classified as active with 6504 units in stock, compared to the obsolete CAL45VB4R7K status. This ensures long-term supply chain continuity.

Compliance and Certification: The B78108E1472K000 is RoHS3 compliant and REACH affected, meeting current regulatory requirements. The substitute's extended operating temperature range of -55°C ~ 125°C provides superior environmental performance compared to the original -25°C ~ 105°C specification.

Physical Dimensions: The substitute measures 0.157" diameter × 0.374" length (4.00 mm × 9.50 mm) compared to the original 0.173" diameter × 0.315" length (4.40 mm × 8.00 mm). Verification of PCB footprint clearance is required prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the B78108E1472K000 be used as a direct replacement for the CAL45VB4R7K?

A: Yes. Both inductors share identical inductance values, tolerance, shielding characteristics, and mounting configurations. The substitute's higher current rating and lower DC resistance provide equivalent or improved performance in the specified application parameters.

Q: What is the significance of the higher current rating on the B78108E1472K000?

A: The B78108E1472K000 is rated for 2.75 A compared to the CAL45VB4R7K's 2.2 A. This higher rating indicates greater thermal capacity and reduced saturation risk at the original operating current, enhancing component reliability and lifespan.

Q: Are there physical dimension differences between these inductors?

A: Yes. The B78108E1472K000 measures 4.00 mm diameter × 9.50 mm length, while the CAL45VB4R7K measures 4.40 mm diameter × 8.00 mm length. PCB layout verification is required to confirm adequate clearance and component spacing before substitution.

Q: Does the DC resistance difference affect circuit performance?

A: The B78108E1472K000 has a maximum DC resistance of 85 mOhm compared to 79 mOhm for the CAL45VB4R7K. This 6 mOhm difference results in minimal additional power dissipation and is acceptable for most applications. Circuit-specific analysis is required for high-current or precision applications.

Q: What is the advantage of the extended temperature range on the substitute part?

A: The B78108E1472K000 operates from -55°C to 125°C, compared to -25°C to 105°C for the original. This extended range provides greater flexibility for applications in extreme environmental conditions and improves component reliability across wider temperature variations.

Q: Is the B78108E1472K000 RoHS compliant?

A: Yes. The B78108E1472K000 is RoHS3 compliant and REACH affected, meeting current environmental and regulatory standards for electronic component manufacturing and use.

Q: What packaging format is available for the B78108E1472K000?

A: The B78108E1472K000 is supplied in Cut Tape (CT) packaging, suitable for automated assembly processes and component handling.